you have to make the changes, but there is no defense to making the changes. even if it is a historical building. that is not a defense. when i get involved, it is because 90% of the time, the tenant is the only one who gets the notice, though the notice is addressed both to the tenant and landlord. next thing you see, you are handed a piece of paper by some stranger, and it is a lawsuit. then you need to find a lawyer. probably 90% of these cases are in federal court. it becomes much more costly to get a lawyer involved. most lawyers charged somewhere between $5,000 or $10,000 to get between $5,000 or $10,000 to get involved in some of these cases.